Radiant heater



FIG. 1 is a top front perspective view of a radiant heater, showing mynew design;

FIG. 2 is a top plan view thereof, shown on a larger scale;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a right side elevational view, the left side being a mirrorimage thereof.

The ornamental design for a radiant heater, as shown and described.